fix: restore receipt endpoint request injection test

[ianalloway]

Summary

• Fixes the receipt endpoint test's FastAPI Request injection under postponed annotations
• Removes the optional Request default so localhost TestClient requests are recognized correctly
• Keeps FastAPI imports lazy so tests still skip cleanly when optional server deps are absent

Test Plan

• .venv/bin/python -m pytest tests/test_receipt.py::TestReceiptEndpoint::test_200_for_valid_job_from_localhost -q
• .venv/bin/python -m pytest tests/test_receipt.py -q
• .venv/bin/python -m pytest tests/ -q

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Keep valid-token test off the localhost bypass

With this new injected Request, the TestClient request is now classified as local by the helper's localhost whitelist, so test_valid_token_grants_access no longer exercises verify_delivery_token at all; the test would pass with an invalid token as long as the job exists. Please force that test through a non-local client host or otherwise make is_local false so it still covers token-gated receipt access.

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